<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            background-color: bisque;
            /* background-color: transparent; */
            
        }
        .bg {
            background-image: url(flower.png);
            height: 500px;
            background-repeat: repeat-y;
            background-position: 100px center;
            background-size: cover;
        }
        .radius {
            width: 200px;
            height: 200px;
            border: 2px solid greenyellow;
            border-radius: 50%;
        }
        .block {
            display: block;
        }
    </style>
</head>
<body>
    <p>段落段落段落段落</p>
    <div class="bg">背景图片</div>
    <div class="radius">圆</div>
    <span class="block">span</span>
</body>
</html>